Where does DataNitro run - is it an add-in, is it a desktop program that operates on external Excel files, or are the files uploaded to, and processed on your site? If it's an add-in, is it Windows-only (COM)?
It all runs locally, Excel files are not sent remotely. No COM is used (god forbid!) for the engine. We have a small plugin for nice UI in Excel, but the engine can be run outside of Excel as well.